Diamond Happy is the 2nd OP to Aikatsu! It sports a high tempo (233 bpm) and heavily features trumpets, guitar, and drums. As described in its title, it is very upbeat and happy. It's my favorite song of the entire first season!

fashion check! is a very light and bubbly song featuring five of the Starlight Academy idols. The performance is similar to a music video, with transitions/scene changes showing the idols in different locations on the stage, which is uncommon in Aikatsu! and makes the performance very interesting.

Of course, what rhythm game pack featuring Aikatsu! would be complete without its namesake song, Idol Activity! This song's fun and cheery tune gives courage and inspiration to those seeking to become future idols.

Because Midnight Skyhigh is the song for a drama audition episode, it unfortunately does not have an associated performance. Despite this, Midnight Skyhigh is a great song with a cool, catchy rhythm, and serves as the perfect theme song for the in-anime crime drama Naughty Detectives.

Take Me Higher is a cool rock song with a subdued tempo that emphasizes bass, drums, and electric guitar. As one of the few songs in Aikatsu to not feature individual singing sequences, Take Me Higher expresses the unity of Tristar as a group. The tone of this song oozes with swagger and displays Tristar's ambitions of aiming higher and being the best.